Composition Praseodymium SiWafer Varistor graphene_hybrid norganic ForceDistanceSpectroscopy SingleLayer Electrode BCZT semifluorinated_alkanes Workfunction CntFilm PFM HafniumDioxide FrictionalForce AtomicSteps SiliconCrystal Crystal Insulator fe_nd_b UnivCollegeLondon IIT-chennai PVAP3HT Fluoride ElectroChemical PECurve Alloy epitaxy Aluminum CrossSection Optoelectonics Materials cross section FrequencyModulation